Messages in this thread Patch in this message | | | From | Khalid Aziz <> | Subject | [PATCH v10 09/10] mm: Allow arch code to override copy_highpage() | Date | Wed, 15 Nov 2017 15:46:24 -0700 |
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Some architectures can support metadata for memory pages and when a page is copied, its metadata must also be copied. Sparc processors from M7 onwards support metadata for memory pages. This metadata provides tag based protection for access to memory pages. To maintain this protection, the tag data must be copied to the new page when a page is migrated across NUMA nodes. This patch allows arch specific code to override default copy_highpage() and copy metadata along with page data upon migration.
Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com> Cc: Khalid Aziz <khalid@gonehiking.org> --- v9: - new patch
include/linux/highmem.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 776f90f3a1cd..0690679832d4 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -237,6 +237,8 @@ static inline void copy_user_highpage(struct page *to, struct page *from, #endif +#ifndef __HAVE_ARCH_COPY_HIGHPAGE + static inline void copy_highpage(struct page *to, struct page *from) { char *vfrom, *vto; @@ -248,4 +250,6 @@ static inline void copy_highpage(struct page *to, struct page *from) kunmap_atomic(vfrom); } +#endif + #endif /* _LINUX_HIGHMEM_H */ -- 2.11.0
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